I had a Winnebago 23' class A that had a lot of steering column jerk when I hit a big bump. It felt like someone hammering on the steering column. It didn't result in a left or right tug, just WHAM! front to rear movement of the steering column when a big bump was hit.
Everything was in good shape, the prev owner installed a stability system with two large coil springs attached from the bottom of the A arm to the spindle on each side that may have helped reduce it. It holds the spindle on-center. The coach was easily blown left and right from air spilling off other cars. The front suspension does not have a huge weight capacity, so to carry the load, they balance most of the weight over the rear axle. This makes the front end relatively lightly loaded and it affects directional stability. The tires are a high profile with soft sidewalls in an attempt to soften the ride. This reduces directional stability a little.
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